US766591A

US766591A - Dental chair.

Info

Publication number: US766591A
Application number: US200247A
Authority: US
Inventors: Frank E Case
Original assignee: Individual
Current assignee: Individual
Priority date: 1903-08-07
Filing date: 1904-03-28
Publication date: 1904-08-02
Anticipated expiration: 1921-08-02

Description

PATENTBD AUG. 2,1904.

F. E. CASE.

DENTAL CHAIR.

APPLICATION FILED MAB. 2a, 1904.

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NO MODEL.

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AT TOR N EY No. 766,591. PATENTED AUG. 2, 1904. I. E. CASE.

DENTAL CHAIR.

APPLIOATION HLBD MAR. 28, 1904` No MODEL. s SHEETS-summa.

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MW. ATTORNEY No. 766,591. PATENTED AUG. 2, 1904, F. E. CASE.

DENTAL CHAIR.

APPLICATION FILED MAR. 28, 1904.

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ATTORNEY Patented August 2, 1904.

UNITED STATES PATENT OFFICE.

FRANK E. CASE, OF CANTON, OHlO.

DENTAL CHAIR.

SPECIFICATION forming part of Letters Patent No. '766.591, dated August 2, 1904.

Original application filed August 7, 1903, Serial No. 168,555. Divided and this application filed March 28, 1904. Serial No. 200,247. (No model.)

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Be itknown that l, FRANK E. CASE, a citizen of the United States, residing at Canton, in the county of Stark and State of Ohio, have invented certain ncw and useful Improvements in Dental Chairs, the same being' illustrated and described, but not claimed, in my application for Letters Patent filed August 7, 1903, Serial No. 168,555, of which application this is a divisional part and of which invention the followingl is a specification.

The invention relates to arotatable and vertically-extensible base for a chair; and the objects of the improvements are to provide a rotatable base on a Hoor-plate with simple and convenient means for joining and manipulating the same and to provide a pump which with all its parts in working order can be readily lifted out of the base. l attain these objects by the construction, mechanism, and arrangement illustrated in the accompanying drawings, in which- Figure l is a perspective vertical section of the chair-base, showing the pump in place; Fig. 2, a perspective view of the base extended with the pump removed, but showing the brake-dog in its proper location; Fig. 3, a detached front elevation of the brake-shaft, showing the release-thimble in section thereon; Fig. e, a detached perspective view of the pump; Fig. 5, a fragmentaryperspective under view of the forward end of the pump; and F ig. 6 a left side elevation of the brakedog and adjoining' and adjacent parts, partly in section.

Similar numerals refer to similar parts throughout the drawings.

The floor-plate 1 is preferably circular in form, and on its upper side is provided the annular iange 2, having' the inturned rim 3, under which rini is formed the groove L1. The base 5 is preferably formed as a cylinder with its sides somewhat flattened and is open above and below and in front. The base terminates The rear part, that is less than one-half of the base, is extended downward below the external flange, and this extended part T'is provided externally on its rim with the annular tongue 8, which tongue is adapted to cnter and travel around in the floor-plate groove. 'Vhen the base is placed on the floor-plate, it is first set slightly forward from its proper position, which advanced position permits the rear depending part to enter inside of the rim of the floorplate fiange, after which the base is pushed directly back, so that the annular tongue enters the annulaigroove in the floorplate iiange.

The box-standard 9 is formed similar in section to the base and telescoped therein, being provided with the usual vertical grooves, as 10, for the corresponding tongues, as 11, formed in the base, and the bodystandard 12 is likewise formed and telescopes in the boxstandard, being provided with the similar grooves, as 13, for the corresponding tongues, as 111, in the box-standard. The body of the chair (not shown) is mounted on the bodystandard, preferably by a horizontal transverse pivot, and it is raised and lowered by the elevation and depression of the respective standards.

The pump 15 and all its parts in working order is formed entirely separate from the floor-plate, the base, and the standards, and it is placed in the base through the open front side thereof. The pump is supported in the base by the lugs 16, formed near the forward edges on its sides and near the top, the inclined lower edges 17 of which lugs being adapted to hook over the bosses 18, which are formed near the top of the forward edges of the base, and the pump is held in position on these supports by the stay-pin 19, located on the forward part of the base-liange, which pin enters the corresponding recess 20 in the under side of the pump when the pump is properly placed in the base.

The brake-dog 9.1 is pivoted at 22 on one side of the pump, from which pivotal point the dog curves downward and forward and terminates below in the toe23, which is adapted to swing forward into the annular groove in the floor-plate flange and to bind against the rim thereof or to be swung back to free` this contact, as shown in Fig. 6x rI`he upper part of the forward end of the brake-clog is extended over the base-flange and forms the head 24, in which head is provided the adjustable contact-screw 25.

The brake-shaft 26 is transversely journaled in the forward part of thel pump, and on the outerfree end of the shaft is formed the brakelever 27, which normally extends forward and slightly upward and has the pedal 28 formed on its end. The inner end of the brake-shaft is somewhat flattened on the lower forward side 29, against which fiat side the head of the contact-screw rests when the brake is released. By depressing the brake-pedal, as by the operators foot, the shaft is rotated to bring its fully-rounded side against the head of the contact-screw, as shown in Fig. 6, whereby the brake-dog is forced forward and its toe is thrust into the groove and against the rim of the floor-plate flange and acts to brake orstop the base against rotation. The recess 30 is provided in the upper forward side of the brake-shaft, into which recess is projected the stop-screw 31, which screw serves the double purpose of limiting its rotation each way and of stopping it against endwise movement.

The upper free end of the pump piston-.rod 32 is attached to the box-standard by means of the bracket 33, which bracket extends through the slot 34, which is provided for it in the body-standard. A pulley, as 35, is pivoted on each inner side near the top of the boxstandard, and on this pulley is mounted the endless c hain 36. A guide-rib,as 37, is formed in each side of the box-standard directly below the pulley, and the endless chains operate along each side of these ribs and around their lower rounded ends. The vertically adjustable bracket 38 is attached in each side of the base at the forward edge near the top, toA which bracket the endless chains are attached by bolts or rivets, as 39, at points opposite the top of the base. When both standards are lowered and telescoped in the base, the endless chains are attached to the bottom of the body-standard by thebolts or rivets, as at 40, so that when the box-standard is raised by the piston-rod by the operation of the pump the chains being attached to the base and after passing over the pulleys on the box-standard, being also attached to the body-standard and its pulleys, will elevate the body-standard at the rate of two to one and when the box-standard is permitted to come down by opening the release-valve the bod y-standard also comes down at this same rate by the positive action teeei of the endless chains passing around the lower end of the guide-ribs.

In order to remove the pump from the chairbase, it is only necessary to detach the pistonrod from the box-standard bracket, whereupon the pump and all of its parts in working order can be lifted bodily out ofthe base, and when the pump is in place its exposed side and the attached parts thereon are preferably arranged to substantially close the open side of the base.

What I claim as my invention, and desire to secure by Letters Patent, is-

l. In a chair, a vfloor-plate having an annular flange with an internal groove thereon, a base having an external annular flange' resting on the floor-plate flange with part of one side of the base extended below the external flange, an annular tongue on the depending part of the base adapted to operate in the floor-plate groove, and a brake-dog pivoted on the opposite side of the base having a toe.

on its free end adapted to be swung to bind against the floor-plate tongue.

2. In a chair, a oor-plate having an annular flange with an internal groove thereon, a base having an external annular flange resting on the Hoor-plate flange with part of one side of the base extended below the external flange, and an annular tongue on the depending part of the base adapted to operate in the plate-groove.

3. In a chair, a floor-plate having an annular flange thereon,l a rotatable base resting on the flange, a brake-dog pivoted on the base and having a toe on its free end adapted to be swung to bind against the flange, a shaft journaled in the base having part of-one side flattened, and a screw in the brake-dog normally having its end in contact with the flat side of.

the shaft.

4. In a chair, a hollow base being open on one side and having bosses on the side edges near the top with an annular flange at the bottom across the side opening there being a stay-pin on the flange, and a pump, adapted to be enteredinto the base through its open side and having lugs near the outer edges on the sides near the top adapted to hook over the base-bosses, and a recess in the bottom of the pump near the outer edge adapted to receive the stay-pin.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

FRANK E. CASE.

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